package interview.alibaba;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;

/**
 * @author <a href="zhaoyingling12@163.com">Zhao Simon</a>
 * @program: arithmetic-learning
 * @description: main test
 * @since
 */
public class Main {
    private static volatile ConcurrentHashMap<String, String> students = new ConcurrentHashMap<>();

    private static volatile Long id = 0L;

    public static void main(String[] args) {
        ConcurrentHashMap<Long, String> map = new ConcurrentHashMap<>();
    }
}
